Tri-wired speaker cables for bi-wire Audio Note AN-E speakers?

I currently have an older pair of Cardas Quadlink 5C bi-wire cables but would like to upgrade for the Audio Note AN-E Spe HE speakers I now own and love. I'm looking for a used set of bi-wire cables that are at least 5m long (room configuration prevents me from using shorter lengths, unfortunately).  My budget is $2K. There aren't many listings that fit the bill, but right now there's a set of well regarded Straight Wire Crescendo 2 cables on ebay, 20-feet long, that seem to fit the bill, but they are tri-wired, not bi-wired. The owner says I can just leave one set of cables unattached, but I'm wondering if that would compromise sound quality.  Also, if I only need 5m, will the extra length unnecessarily compromise SQ as well? Thank you in advance!